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Re: Need some general help about VNAs
ok, probably the information check of the firmware shows Sysjoint. This was my espectation.Thank you!
Yahoo Mail: Suchen, organisieren, erobern Am Mi., Juni 4, 2025 at 18:37 schrieb Claus - DO1SC via groups.io<do1sc@...>: I ordered one from Amazon, the brand name is Aursinc. Basicly it might be Sysjoint inside. |
Re: NanoVNA S11 Accurary plotted on Smith Diagram
Again, the standard impedance (resistance) against which the vast majority
of all things RF are measured is 50 ¡À j 0 ohms. Yes, the NANOVNAs contain a 50-ohm bridge. Yes, this is the standard impedance throughout the RF/?W industries. However, anyone can normalize the center of the Smith Chart, the "bull's eye", to any resistance he/she chooses. I much prefer the resistance standard of 50 ¡À j 0. Dave - W?LEV On Tue, Jun 3, 2025 at 6:43?PM Team-SIM SIM-Mode via groups.io <sim31_team= [email protected]> wrote: Hi Dave-- *Dave - W?LEV* -- Dave - W?LEV |
Re: Need some general help about VNAs
Try Amazon or Aliexpress
________________________________ From: [email protected] <[email protected]> on behalf of Werner via groups.io <whxde@...> Sent: Wednesday, June 4, 2025 7:12 AM To: [email protected] <[email protected]> Subject: Re: [nanovna-users] Need some general help about VNAs @Claus There are serveral brands in the market, looking all the same, for example Sysjoint, Seesii, Chelegance and other nonames. In ebay I can find only Siisee. I imagine under the hood is Sysjoint, but the vendor put his brand label on it. But I am not sure. Ebay comes handy because they are in stock in Germany, delivery 3 days, and no additional toll/taxes. Do you know something more? |
Re: Need some general help about VNAs
@Claus
There are serveral brands in the market, looking all the same, for example Sysjoint, Seesii, Chelegance and other nonames. In ebay I can find only Siisee. I imagine under the hood is Sysjoint, but the vendor put his brand label on it. But I am not sure. Ebay comes handy because they are in stock in Germany, delivery 3 days, and no additional toll/taxes. Do you know something more? |
Re: Testing end fed radio traps
On Tue, Jun 3, 2025 at 02:54 AM, Ted Garrett wrote:
W2AEW has an excellent video describing how it is done with A VNA and with a grid dip meter. His coupling is a little tighter than I would use. The looser the better because the coupling loop slightly effects the inductance of the trap. Roger |
Re: NanoVNA S11 Accurary plotted on Smith Diagram
Hi Dave
Thanks Dave for the reminder of the theoretical definition of the Smith chart, but the blue bounded circle is more indicative of the rough limits of good S11 accuracy of the NanoVNA which uses a simple 50 Ohm pure resistance bridge, it may helps us to be quickly confident of the impedance NanoVNA measurements ploted inside the blue circle . simple and usefull vision I say. 73's Nizar |
Re: Need some general help about VNAs
My favorite of all the (inexpensive) NANOVNAs is the SAA-2N. Robust
packaging with a metal case and Type-N connectors. Further, the Type-N connectors are securely fastened to the metal case instead of directly to the internal PCB. It's a winner in my book for both ruggedness and performance plenty adequate for my applications. Dave - W?LEV On Tue, Jun 3, 2025 at 6:40?AM Werner via groups.io <whxde= [email protected]> wrote: Okay,-- *Dave - W?LEV* -- Dave - W?LEV |
Re: NanoVNA S11 Accurary plotted on Smith Diagram
The attachment may help. Extreme left on the central horizontal axis is
zero-ohms. extreme right on the central horizontal axis is infinite ohms. Dave - W?LEV On Tue, Jun 3, 2025 at 4:07?PM Team-SIM SIM-Mode via groups.io <sim31_team= [email protected]> wrote: Hi All-- *Dave - W?LEV* -- Dave - W?LEV |
NanoVNA S11 Accurary plotted on Smith Diagram
Hi All
As discussed many times here, the S11 accuracy domaine subject for imp¨¦dance measurement , May be we can summarize graphically in an intuitive, simple and useful way by the domain inside the blue circle of the Smith chart where the complex impedances are between 1 and 1000 Ohm , we can thus quickly be assured of the precision of our measurements by simply glancing at the Smith diagram. see graph attached. 73's Nizar |
Re: Need some general help about VNAs
Okay,
thank you guys for all the informations. About Deepelec, the Encoder-wheel is nice and probably makes more fun to play with. As I would like a 3 GHz version (for example QO100) probably I will not decide for it. For all I read, comparing the specs, the LiteVNA "6GHz" is on top, for the 1000 measurepoints, speed advantage and dynamic, if specs of all devices are real. But I think I will go to the NanoVNA-F "V2" 3GHz as a compromise. This one has "only" 300 points and less speed, but the overall features like housing, better display and mecanical construction (battery) is nice. It seems to me that the developement is somewhat newer. More detailled. A "V3" Version with 6GHz is already released, 800 measurepoints. Here is a video comparision between the V2 and V3. Interesting is the signal comparision (V2 is better), what I think is preferable over the 800 points, and aside I dont need 6GHz. I have no insight in the RF designs, mixer, switches, synthesizer, advantages/disadvantages. I read a lot and got some oversight. Thanks again, Werner |
Re: Need some general help about VNAs
From a user stand point the use of a rotary encoder as opposed to the jiggle/joystick or the push buttons is a more intuitive process. the push button included in the rotary encoder is also more intuitive as well. I have this function on another device and it is also easier for fat fingers as opposed to the jiggle stick of the tiny buttons.
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Re: Need some general help about VNAs
I have the NanoVNA-F - think it's V2.
The last firmware updates increased the max data points somewhat. Don't recall exactly what it was though. We've just moved so it's still packed up somewhere. I don't mess with anything UHF and up much. If I had it to do again, I'd be tempted by one of the newer models that comes with N-Connectors and the bigger screen. I hate the little SMA connectors for their fragility. The -F is much easier to do firmware update though. -- --Bryon, NF6M |
Re: Need some general help about VNAs
FYI, there IS a GIO group specific to the Nanovna-F:
/g/nanovna-f </g/nanovna-f/files> DaveD KC0WJN On Mon, Jun 2, 2025 at 10:11 Bob Ecclestone VK2ZRE via groups.io <becclest= [email protected]> wrote: Hello Werner, |
Re: Need some general help about VNAs
Hello Werner,
toggle quoted message
Show quoted text
Have a look at the Deepelec website. Look at his DeepVNA-101 which is his latest offering with a rotary encoder instead of pushbuttons or a rocker switch. The developer there is Leon and he builds a unit pretty well compatible with Sysjoint. He used to work there. It is not a clone in the bad sense, Leon has made some useful tweaks to the design. It is well made with quality accessories. I know the Deepelec FW is compatible with the Sysjoint NanoVNA V2. The V2 is no longer supported by Sysjoint, so this is a worthwhile update. I do not think it is compatible with the Sysjoint NanoVNA V3 hardware. If you decide to go that way, JUST MAKE SURE YOU BUY FROM HIS RECOMMENDED STORE! I cannot stress this enough! Just a work of warning, the FW update file contains 3 separate files for the slightly different jogwheel, pushbutton or encoder models. You need to load the correct FW file for the model you have. The information on the website is quite clear. But if you buy a -101, it will have the latest FW already loaded. All Deepelec hardware is definitely NOT compatible with any version of NanoVNA-H4 FW, Hugen or DiSlord. Leon's V1.0.5 FW is not as up to date as the current Hugen/DiSlord NanoVNA-H4 but it has an aluminium case, 800x600 IPS screen and up to 401 scan points. It is great in bright light. That said, I think the current release of the Hugen NanoVNA-H4 hardware may have a lower resolution 640x480 IPS screen now as the old TFT screen has become unobtainium. Someone else may be able to confirm or deny this. BTW, there is a specific nanovna-f group if you would like to join that group as well. HTH. Bob VK2ZRE On 2/06/2025 10:31 pm, Werner via groups.io wrote:
Hello Dave, |
Re: Need some general help about VNAs
Hello Dave,
yes its hard to find the right thing. What I got is, that the Sysjoint NanoVNA-f V2 has now 301 measurepoints. And Chelegance states the same. The firmware between theese seems the same. Probably these (and probably Seesii) are the same product but I am not sure about that. The overall construction of the NanoVNA-f V2 I would like some more than the LiteVNA. Well, I will look a littler further. Thanks a lot, Werner I |
Re: Need some general help about VNAs
I will offer a single bit of advice: Buy *only* from approved
distributors!!! The clones do not have the same hardware and, therefore, do not perform as well. Further, they don't take the advertised FW updates. Buyer beware! In the US, I buy from randl.com. Here is a treatment of most of your questions: Dave - W?LEV On Sun, Jun 1, 2025 at 8:38?PM Werner via groups.io <whxde= [email protected]> wrote: Hello, I am interested in buying a nanoVNA-F V2 or liteVNA.-- *Dave - W?LEV* -- Dave - W?LEV |
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